Documentation improvements

docs/api/command-line.md

@@ -1,3 +1,5 @@
+[< back to index](../index.md)
+
 # Command-line options
 
 ## General options

docs/api/famicom-programming-guide.md

@@ -1,3 +1,5 @@
+[< back to index](../index.md)
+
 # Famicom/NES programming guide
 
 ## Program lifecycle

docs/api/getting-started.md

@@ -1,3 +1,5 @@
+[< back to index](../index.md)
+
 # Getting started
 
 ## Hello world example

docs/api/target-platforms.md

@@ -1,3 +1,5 @@
+[< back to index](../index.md)
+                                                      
 # Target platforms
 
 Currently, Millfork supports creating disk- or tape-based programs for Commodore, Apple and Atari 8-bit computers, 
@@ -167,4 +169,6 @@ Default: `after_code`.
     
     * `<segment>:<addr>:<addr>` - inclusive range of bytes in a given segment
     
-* `extension` – target file extension, with or without the dot
+* `extension` – target file extension, with or without the dot
+
+* `bbc_inf` – should the `.inf` file with file metadata for BBC Micro be created